It's ok to use the 32-bit installer on a 64-bit system.Hi Here are the answers of your questions:
1. I use Windows 7 Home Premium 64-bit
2. I installed Dash from the installer : dash-0.11.1.26-win32-setup.exe
I see that the installer is 32-bit program, but my operation system is 64-bit.
So maybe there is some incompatibility.